The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 30, 1989
Filed:
Feb. 26, 1987
Applicant:
Inventors:
Takaaki Murai, Hiroshima, JP;
Shoji Watanabe, Hiroshima, JP;
Kimio Inoue, Hiroshima, JP;
Tomohisa Isobe, Yamaguchi, JP;
Naoki Nakashima, Hiroshima, JP;
Takuya Miho, Hiroshima, JP;
Yoshiyuki Ikemoto, Kanagawa, JP;
Assignee:
Daicel Chemical Industries, Ltd., Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08L / ;
U.S. Cl.
CPC ...
525 36 ; 525 40 ; 525 43 ; 525 49 ; 523511 ;
Abstract
A process for producing a lactone polymer which comprises reacting an ester compound synthesized from an alcohol and an acid or acid anhydride thereof with a lactone and a ring-opening polymerization initiator without being accompanied by condensation. The thus produced lactone polymer is effective for preventing shrinkage of thermosetting resins, particularly unsaturated polyester resins.